#pragma warning disable CS1591

using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Common.Configuration;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Entities.Movies;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Globalization;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.Providers;
using MediaBrowser.Model.Serialization;
using MediaBrowser.Providers.Plugins.Tmdb.Models.Collections;
using MediaBrowser.Providers.Plugins.Tmdb.Models.General;
using MediaBrowser.Providers.Plugins.Tmdb.Movies;
using Microsoft.Extensions.Logging;

namespace MediaBrowser.Providers.Plugins.Tmdb.BoxSets
{
    public class TmdbBoxSetProvider : IRemoteMetadataProvider<BoxSet, BoxSetInfo>
    {
        private const string GetCollectionInfo3 = TmdbUtils.BaseTmdbApiUrl + @"3/collection/{0}?api_key={1}&append_to_response=images";

        internal static TmdbBoxSetProvider Current;

        private readonly ILogger<TmdbBoxSetProvider> _logger;
        private readonly IJsonSerializer _json;
        private readonly IServerConfigurationManager _config;
        private readonly IFileSystem _fileSystem;
        private readonly IHttpClientFactory _httpClientFactory;
        private readonly ILibraryManager _libraryManager;

        public TmdbBoxSetProvider(
            ILogger<TmdbBoxSetProvider> logger,
            IJsonSerializer json,
            IServerConfigurationManager config,
            IFileSystem fileSystem,
            IHttpClientFactory httpClientFactory,
            ILibraryManager libraryManager)
        {
            _logger = logger;
            _json = json;
            _config = config;
            _fileSystem = fileSystem;
            _httpClientFactory = httpClientFactory;
            _libraryManager = libraryManager;
            Current = this;
        }

        private readonly CultureInfo _usCulture = new CultureInfo("en-US");

        public async Task<IEnumerable<RemoteSearchResult>> GetSearchResults(BoxSetInfo searchInfo, CancellationToken cancellationToken)
        {
            var tmdbId = searchInfo.GetProviderId(MetadataProvider.Tmdb);

            if (!string.IsNullOrEmpty(tmdbId))
            {
                await EnsureInfo(tmdbId, searchInfo.MetadataLanguage, cancellationToken).ConfigureAwait(false);

                var dataFilePath = GetDataFilePath(_config.ApplicationPaths, tmdbId, searchInfo.MetadataLanguage);
                var info = _json.DeserializeFromFile<CollectionResult>(dataFilePath);

                var images = (info.Images ?? new CollectionImages()).Posters ?? new List<Poster>();

                var tmdbSettings = await TmdbMovieProvider.Current.GetTmdbSettings(cancellationToken).ConfigureAwait(false);

                var tmdbImageUrl = tmdbSettings.images.GetImageUrl("original");

                var result = new RemoteSearchResult
                {
                    Name = info.Name,
                    SearchProviderName = Name,
                    ImageUrl = images.Count == 0 ? null : (tmdbImageUrl + images[0].File_Path)
                };

                result.SetProviderId(MetadataProvider.Tmdb, info.Id.ToString(_usCulture));

                return new[] { result };
            }

            return await new TmdbSearch(_logger, _json, _libraryManager).GetSearchResults(searchInfo, cancellationToken).ConfigureAwait(false);
        }

        public async Task<MetadataResult<BoxSet>> GetMetadata(BoxSetInfo id, CancellationToken cancellationToken)
        {
            var tmdbId = id.GetProviderId(MetadataProvider.Tmdb);

            // We don't already have an Id, need to fetch it
            if (string.IsNullOrEmpty(tmdbId))
            {
                var searchResults = await new TmdbSearch(_logger, _json, _libraryManager).GetSearchResults(id, cancellationToken).ConfigureAwait(false);

                var searchResult = searchResults.FirstOrDefault();

                if (searchResult != null)
                {
                    tmdbId = searchResult.GetProviderId(MetadataProvider.Tmdb);
                }
            }

            var result = new MetadataResult<BoxSet>();

            if (!string.IsNullOrEmpty(tmdbId))
            {
                var mainResult = await GetMovieDbResult(tmdbId, id.MetadataLanguage, cancellationToken).ConfigureAwait(false);

                if (mainResult != null)
                {
                    result.HasMetadata = true;
                    result.Item = GetItem(mainResult);
                }
            }

            return result;
        }

        internal async Task<CollectionResult> GetMovieDbResult(string tmdbId, string language, CancellationToken cancellationToken)
        {
            if (string.IsNullOrEmpty(tmdbId))
            {
                throw new ArgumentNullException(nameof(tmdbId));
            }

            await EnsureInfo(tmdbId, language, cancellationToken).ConfigureAwait(false);

            var dataFilePath = GetDataFilePath(_config.ApplicationPaths, tmdbId, language);

            if (!string.IsNullOrEmpty(dataFilePath))
            {
                return _json.DeserializeFromFile<CollectionResult>(dataFilePath);
            }

            return null;
        }

        private BoxSet GetItem(CollectionResult obj)
        {
            var item = new BoxSet
            {
                Name = obj.Name,
                Overview = obj.Overview
            };

            item.SetProviderId(MetadataProvider.Tmdb, obj.Id.ToString(_usCulture));

            return item;
        }

        private async Task DownloadInfo(string tmdbId, string preferredMetadataLanguage, CancellationToken cancellationToken)
        {
            var mainResult = await FetchMainResult(tmdbId, preferredMetadataLanguage, cancellationToken).ConfigureAwait(false);

            if (mainResult == null)
            {
                return;
            }

            var dataFilePath = GetDataFilePath(_config.ApplicationPaths, tmdbId, preferredMetadataLanguage);

            Directory.CreateDirectory(Path.GetDirectoryName(dataFilePath));

            _json.SerializeToFile(mainResult, dataFilePath);
        }

        private async Task<CollectionResult> FetchMainResult(string id, string language, CancellationToken cancellationToken)
        {
            var url = string.Format(CultureInfo.InvariantCulture, GetCollectionInfo3, id, TmdbUtils.ApiKey);

            if (!string.IsNullOrEmpty(language))
            {
                url += string.Format(CultureInfo.InvariantCulture, "&language={0}", TmdbMovieProvider.NormalizeLanguage(language));

                // Get images in english and with no language
                url += "&include_image_language=" + TmdbMovieProvider.GetImageLanguagesParam(language);
            }

            cancellationToken.ThrowIfCancellationRequested();

            using var requestMessage = new HttpRequestMessage(HttpMethod.Get, url);
            foreach (var header in TmdbUtils.AcceptHeaders)
            {
                requestMessage.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue(header));
            }

            using var mainResponse = await TmdbMovieProvider.Current.GetMovieDbResponse(requestMessage, cancellationToken).ConfigureAwait(false);
            await using var stream = await mainResponse.Content.ReadAsStreamAsync().ConfigureAwait(false);
            var mainResult = await _json.DeserializeFromStreamAsync<CollectionResult>(stream).ConfigureAwait(false);

            cancellationToken.ThrowIfCancellationRequested();

            if (mainResult != null && string.IsNullOrEmpty(mainResult.Name))
            {
                if (!string.IsNullOrEmpty(language) && !string.Equals(language, "en", StringComparison.OrdinalIgnoreCase))
                {
                    url = string.Format(CultureInfo.InvariantCulture, GetCollectionInfo3, id, TmdbUtils.ApiKey) + "&language=en";

                    if (!string.IsNullOrEmpty(language))
                    {
                        // Get images in english and with no language
                        url += "&include_image_language=" + TmdbMovieProvider.GetImageLanguagesParam(language);
                    }

                    using var langRequestMessage = new HttpRequestMessage(HttpMethod.Get, url);
                    foreach (var header in TmdbUtils.AcceptHeaders)
                    {
                        langRequestMessage.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue(header));
                    }

                    await using var langStream = await mainResponse.Content.ReadAsStreamAsync().ConfigureAwait(false);
                    mainResult = await _json.DeserializeFromStreamAsync<CollectionResult>(langStream).ConfigureAwait(false);
                }
            }

            return mainResult;
        }

        internal Task EnsureInfo(string tmdbId, string preferredMetadataLanguage, CancellationToken cancellationToken)
        {
            var path = GetDataFilePath(_config.ApplicationPaths, tmdbId, preferredMetadataLanguage);

            var fileInfo = _fileSystem.GetFileSystemInfo(path);

            if (fileInfo.Exists)
            {
                // If it's recent or automatic updates are enabled, don't re-download
                if ((DateTime.UtcNow - _fileSystem.GetLastWriteTimeUtc(fileInfo)).TotalDays <= 2)
                {
                    return Task.CompletedTask;
                }
            }

            return DownloadInfo(tmdbId, preferredMetadataLanguage, cancellationToken);
        }

        public string Name => TmdbUtils.ProviderName;

        private static string GetDataFilePath(IApplicationPaths appPaths, string tmdbId, string preferredLanguage)
        {
            var path = GetDataPath(appPaths, tmdbId);

            var filename = string.Format(CultureInfo.InvariantCulture, "all-{0}.json", preferredLanguage ?? string.Empty);

            return Path.Combine(path, filename);
        }

        private static string GetDataPath(IApplicationPaths appPaths, string tmdbId)
        {
            var dataPath = GetCollectionsDataPath(appPaths);

            return Path.Combine(dataPath, tmdbId);
        }

        private static string GetCollectionsDataPath(IApplicationPaths appPaths)
        {
            var dataPath = Path.Combine(appPaths.CachePath, "tmdb-collections");

            return dataPath;
        }

        public Task<HttpResponseMessage> GetImageResponse(string url, CancellationToken cancellationToken)
        {
            return _httpClientFactory.CreateClient(NamedClient.Default).GetAsync(url, cancellationToken);
        }
    }
}
